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Old 08-30-2009, 04:10 AM
urtall1
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Default 2003 Nissan altima 2.5 S

Got the code, it is; PO420. read at AutoZone. According to them its the catalytic system, and possible problems were;

fuel system fault
large vacuum leak
ignitioin system fault
or faulty catalytic converter

and this website maybe narrowed it down further, I don't know, but your website said;

TW (two-way) Catalyst System, Bank 1. what ever that means. LOL

anyway, I did have my upper and lower radiator hoses replaced along with my thermostat recently and a coolant flush. it was performed by my mechanic, who routinely does not work on this car. I wonder if he knocked a hose loose or something. I plan to get under the car today to look for things that are not connected. and if you have any other suggestions, please let me know.

Dale
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